Why does my phone is heat up instantly after turning on mobile data?

Few days back when upgraded to MIUI 7.5.3 (stable), phone started heating when mobile data turned on but not on WiFi then I upgraded to MIUI 8 stable and still the problem is same. What could b the solution?

    Well, that's odd. How's your network signal? I'm guessing here that maybe your phone is having a hard time getting network signal.

        Hi Carl,

    Yeah I do have a lot of apps but whenever I use my phone on wifi, it doesn't heat up but only when I turn on mobile data it starts heating up. BTW thank you for your kind reply

    Hi Ram. Do you have a lot of apps that uses data/internet? I'm thinking here that they all start to sync to their servers that's why your phone heats up upon getting internet connection.

    Not the answer you were looking for?